It helps you to kill the unwanted apps that currently in process to free your memory of iPhone and works faster...
Double click your "Home Button"
Long press on the 'app icons'
Press 'red mark minus' to kill the app
The memory which are utilized by other apps which are not used by you at moment is said to be 'wired memory'
Double click your "Home Button"
Long press on the 'app icons'
Press 'red mark minus' to kill the app
Enjoy using iPhone..!!